51810233621 has 2 divisors, whose sum is σ = 51810233622. Its totient is φ = 51810233620.

The previous prime is 51810233611. The next prime is 51810233647. The reversal of 51810233621 is 12633201815.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 48349852996 + 3460380625 = 219886^2 + 58825^2 .

It is a cyclic number.

It is not a de Polignac number, because 51810233621 - 2¹⁴ = 51810217237 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (51810233611) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 25905116810 + 25905116811.

It is an arithmetic number, because the mean of its divisors is an integer number (25905116811).

Almost surely, 2^51810233621 is an apocalyptic number.

It is an amenable number.

51810233621 is a deficient number, since it is larger than the sum of its proper divisors (1).

51810233621 is an equidigital number, since it uses as much as digits as its factorization.

51810233621 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 8640, while the sum is 32.

The spelling of 51810233621 in words is "fifty-one billion, eight hundred ten million, two hundred thirty-three thousand, six hundred twenty-one".